One vertex per element, one color per generator, with an edge from x to x·s.
(5,6)(7,10)(8,9)(11,12)(13,14,18,20)(15,17,16,19)(21,22,25,26)(23,27,29,34)(24,31,32,28)(30,36,33,35)(2,4)(6,9)(10,11)(13,15,18,16)(14,19,20,17)(22,26)(23,29)(24,32)(35,36)(1,2)(3,4)(21,22)(23,27)(24,28)(25,26)(29,34)(30,35)(31,32)(33,36) involution — undirected(5,7,8,12)(6,10,9,11)(13,16,18,15)(14,17,20,19)(21,23,25,29)(22,27,26,34)(24,33,32,30)(28,36,31,35)(5,6)(7,11)(8,9)(10,12)(13,17)(14,16)(15,20)(18,19)(21,24,25,32)(22,28,26,31)(23,30,29,33)(27,35,34,36)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.